Fan



May 16, 1933. D. fuo'GDEN 1,909,385

FAN

Original Filed Dec. 17, 1929 Patented May 16, 1933 UNITED STATES PATENTOFFICE i DANA IP. OGDEN, 0F OTTAWA, ILLINOIS, ASSIGNOR 0F ONE-HALF TOERWIN F. PLUMB, 0F STREATOR, ILLINOIS FAN Original application filedDecember 17, 1929, Serial No. 414,641. Divided and this application ledApril This application is a division of my copending application SerialNo. 414,641, filed December 17, 1929. The invention relates to fanstructure suitable for operationin places where highly heated gases maycome into direct Contact with the fan. The fan hereinafter described isintended for use at temperatures of the order of 2000O F., the object ofthe invention being to provide a fan which can be operatedsatisfactorily at thosetempera-tures, which is easily assembled, andwhich can readily be repaired or renewed.`

For a more complete understanding of the invention reference may be hadto the description which follows and to the drawing, in which,-

Figure 1 is an elevation, partly in section, of a fan embodying theinvention.

Figure 2 is a section on the line 2-2 of Figure 1.

Figure 3 is a perspective View of the fansupporting end of the fanshaft.

Figure 4 is a fragmentary section, similar to Figure 2, showing anotherform of the invention.

The fan shaft 10 is preferablv split by several slots 11 extendinglongitudinally from the fan bearing end. The shaft is preferably made ofhigh-resistant metal such as chromium nickel alloys of iron which may becapable of satisfactory operation at temperatures of the order of 2000oF. For example, one such alloy may comprise chromium 30%, nickel 15% andiron 45%. lower temperatures, that is, around 1400o to 1600 F.,so-called calorized iron can be used, this consisting of iron which hasbeen packed in aluminum dust and heated for a consi derable time.

The fan blades may be individually cast of suitable metals such as thosehercinbefere referred to. As shown in Figures 1 and 2, cach separateblade 12 may have a segmental bead 13 at its inner end. rlhe blades areadapted to slide into the several slots 11, the beads 13 being withinthe hollow shaft 10, as indicated For somewhat Serial No. 529,733.

adjacent to the outer surface of the shaft 10` to receive suitable pins14 by which the blades are secured in place. Each blade is preferablyformed with a central slot 15 through which may be positioned one ormore U- shaped pieces 16 which are riveted as at 17 to the blade. Byproper selection of the weight of these U-shaped members inequalities inthe weight distribution of the several bla-des of a fan may becompensated for so that the completed fan may be substantial rotativebalance. This is of particular importance where fans having vanesofsubstantial weight are employed and also where they are subjected tosevere operating conditions occasioned by direct contact of the hotgases.

If desired, the blades 12 may be cast together integrally with a singlehub member 20, as shown in Figure 4. The blades on the hub 20 areangularly spaced so as to enter the several slots 11 simultaneously, thehub 20 beingof suliciently smally diameter to lit in the interior of thehollow shaft 10. In either type of construction, the blades may be heldagainst axial movement on the shaft 10 as by a pair of suitable collars21, 22 which may be secured on the shaft 10 as by suitable pins orrivets 23.

I claim:

1. A mechanism of the class described comprising a hollow shaft havinglongitudinally arranged slots, and fan blades having portions extendingthrough said slots and portions engaging the inner wall of said shaftadjacent to said slots.

2. A mechanism of the class described comprising a hollow shaft havinglongitudinally arranged slots, and fan blades having por-V tionsextending through said slots and portions engaging the inner wall ofsaid'shaft adjacent to said slots, said engaging portions `of all ofsaid blades together engaging said inner wall throughout its entireangular eX,n

tent.

3. A mechanism of the class described comsignature. Y

DANA P. OGDEN.

CERTIFICATE 0F CGRRECTION.

Patent No. 1,909,885. May 16, 1933.

DANA P. OGDEN.

1t is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: In theheading to the printed specification, the name of the assignee ofone-half interest was erroneously written and printed as "Erwin F.Plumb" whereas said name should have been written and printed as "ErminF. Plumb" as shown by the record of the case in this office; and thatthe said Letters Patent should be read with this correction therein thatthe same may conform to the record of the case in the Patent Office.

Signed and sealed this 18th day of July, A. D, 1933.

M. J. Moore.

(Seal) Acting Commissioner of Patents.

